Method of making shears for metal plates



N. KRUMP. METHOD'OF MAKING SHEARS FDR METAL PLATES. APPLICATION FILED m. 16, I920.

1,485,719. Pmnted Nov. 141, 11922,

2 SHEETS-SHEET I.

'N'. KRUMP. METHOD .OF MAKING SHEARS FOR METAL PLATES. APPLICATION mmuic. l6, I92Q.

2 SHEETS-SHEEI 2.

mnt'ealwov. 14,1922.

Patented Nov. 14,1922.

NIC KBUMP, OF CHICAGO, ILLINOIS.

Application filed December 16, 1920. Serial No. 431,173.

To all whom it may concern:

Be it known that 1, N10 KRUMP, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Methods'of Making Shears for Metal Plates, of which the following, reference being had to the drawingsacco'mpanying and forming a part hereof, 1s a specification.

The invention relates to shears which are used to cut plates of sheet metal, as tin, brass, copper and other similar material.

Among the objects of the invention are to lessen the cost and increase the durability of shears which are adapted to out long plates of sheet metal; to obtain shears which are not liable to break or get out of order; to obtain shears which consist of few parts and the members whereof are joined together in a manner which obviates liability to get out of adjustment; and to obtain shears which are easily operated.

In the drawings referred to F 1 is an end view of the base of the shears, in full lines, with broken lines indicating the portion of the Zbar which is turned from its normal position to form said frame.

Fig. 2 is a side elevation of shears embodying the invention.

Fig. 3 is a vertical section on line of Fig. 2, viewed as indicated by arrows.

Fig. at is a top plan view of. shears; and

F 5 is a horizontal section on line 55 of Fig. 2, viewed as indicated by arrows.

A. reference character applied to designate a given part indicates said part throughout the several figures of the drawings wherever the same appears.

A, A A and A represent the frame of the shears; A being the base, A and A vertical members, and A a. curved member. A", A, indicate, by broken lines, the parts or portions of the 2 bar which form the curved part A of the frame, and the vertical mernber A as said parts or portions originally appear in the Z-bar used. a, a, Figs 1, 2 and 3, represent the contour lines of the sides of a cut which is made in the Z-bar from which the frame is obtained, and a represents the slot or recess obtained by said cut, which slot or recess extends inward from the left hand end of the frame as viewed in Fig. 2, to the curved linea It will be observed that the cutting away or removal of the portion of the Z-bar be tween lines a, (1 Figs. 1 and 2, to curved line a Fig. 2; and the bending of the part or portion of said Z-bar between said line a and the right hand end of the Z-bar, as viewed in said Fig. 2, to obtain substantially the curve A Fig. 1, in no material manner or extent changes the right angle between the vertical member A and the horizontal member A of the Z-bar, as said angle originally exists between said members; and that said curving or bending of the portion of the Z- bar which forms member A positions the vertical member A in a plane to the right hand side of, and parallel to the plane in which the member A is positioned.

represents a cutting member which is rigidly secured on vertical member A of the frame, by bolts 6, Z), and nuts 6 Z2 on said bolts; and B represents the cutting edge of said member. C represents a cutting member which is pivotally mounted on bolt D, said bolt extending through vertical member A of the frame. C represents the cutting edge of said member C. E represents a link which also is pivot-all D, said bolt forming the fulcrum of member 0 and link E. F represents a lever to one end of which the member C and link E, respectively, are pivotally connected. The cutting member C and link E are held in suitable relative position to each other and to vertical member A of the frame, and to lever F, by nuts (Z, and g, on said bolts D and (Jr, respectively. H, Fig. 2, indicates by broken lines in Fig. 5, and illustrates by full lines in Fig. 2, gear teeth, on the left hand end, as viewed in said figures of vertical member A and integral therewith. I, I, represent gear on the end of lever F which is adjacent to said left hand end of member A which intermesh with teeth H, H; and as said lever F is turned contrary to clockwise movement, as indicated by arrow X, Fig. 2, the ends of link E and cutting member C, which are pivotally mounted on bolt G, are forced downward, turning on their fulcrum, bolt D; and forcing the cutting edge C down into shearing engagement with cutting edge B of member B. Sheet metal placed between said cutting members B, C, will be cut or sheared thereby.

Observation of Figs. 1, 3, 4E and 5, will make it evident that after a shear out has been made at the end of a sheet or strip of 1 mounted on bolt sheet metal, said sheet or strip can be pushed toward the right, as viewed in Figs. 2,4 and 5, and a long sheet or strip of sheet metal can be cut, notwithstanding the short length oi the cutting members B and U, as compared to the length of said sheet.

Due to the short length of said cutting members B, C, and the great purchase obtained by the mounting of lever F, having gear teeth thereon and integral therewith, the cutting member C, link E, and gear teeth H, H, as hereinbefore recited, and the rigidity of the "frame obtained from the Z-bar, in the manner described, a comparatively thick sheet of metal can be cut or sheared by these shears, as well as a long sheet thereof.

I claim:

In shears for metal plates, the method of constructing a frame from a Z-bar, which comprises the cutting away of a portion of the connecting web of the bar, commencing at one end thereof, the cutting of gear teeth at said end on one of the flanges of said bar, and the curving of said connecting web to position said flange having said teeth in a plane at right angles to the plane of the remaining plane, whereby said remaining flange forms the base of said frame.

NIC KRUMP.

In the presence of CLAUDE C. LAKE, THOS J. KELLEHER. 

